Opinions from P. Brodkorb 1971
- 'Apatornis belongs to Apatornithidae'
- 'Archaeopteryx lithographica belongs to Archaeopteryx'
- 'Archaeopteryx siemensii belongs to Archaeopteryx'
- 'Baptornis belongs to Baptornithidae'
- 'Baptornis advenus belongs to Baptornis'
- 'Baptornithidae belongs to Podicipediformes'
- 'Caenagnathus collinsi belongs to Caenagnathus'
- 'Colonosaurus is a subjective synonym of Ichthyornis'
- 'Colonosaurus mudgei is a subjective synonym of Ichthyornis dispar'
- 'Coniornis belongs to Hesperornithidae'
- 'Coniornis altus belongs to Coniornis'
- 'Enaliornis belongs to Enaliornithidae'
- 'Enaliornis segdwicki is corrected as Enaliornis sedgwicki and belongs to Enaliornis'
- 'Gallornis belongs to Torotigidae'
- 'Gallornis straeleni belongs to Gallornis'
- 'Hesperornis gracilis belongs to Hesperornis'
- 'Hesperornis regalis belongs to Hesperornis'
- 'Ichthyornis celer is recombined as Apatornis celer'
- 'Ichthyornis dispar belongs to Ichthyornis'
- 'Ignotornis mcconnelli belongs to Ignotornis'
- 'Laopteryx priscus is corrected as Laopteryx prisca and belongs to Laopteryx'
- 'Neogaeornis wetzeli belongs to Neogaeornis'
- 'Ornithomimus altus belongs to Ornithomimus'
- 'Ornithosuchus taylori belongs to Ornithosuchus'
- 'Ornithosuchus woodwardi belongs to Ornithosuchus'
- 'Palaeonornis struthionoides belongs to Palaeonornis'
- 'Parascaniornis belongs to Torotigidae'
- 'Parascaniornis stensioei [misspelled as Parascaniornis stensioi] belongs to Parascaniornis'
- 'Pelagornis barretti is recombined as Enaliornis barretti'
- 'Plegadornis antecessor belongs to Plegadornis'
- 'Scleromochlus taylori belongs to Scleromochlus'
- 'Torotix belongs to Torotigidae'